Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Continuous Unrealized Loss Position (Details)

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Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Fair Value $ 216,797
Gross Unrealized Losses (85)
Corporate debt securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 88,354
Gross Unrealized Losses (32)
Municipal securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 3,671
Gross Unrealized Losses (3)
U.S. Government agency securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 37,246
Gross Unrealized Losses (13)
U.S. Treasury securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 87,526
Gross Unrealized Losses $ (37)